Figure 2 - 8700 Allstar Engine Operating Modes - NorthStar 8700 Technical Reference Manual

Section 4 - GPS receivers
4.1.3 Operating
modes
PAGE 12
Acquisition time
60 seconds typical Time-To-First-Fix (TTFF) with current almanac
•
Reacquisition time
< 1 second typical to re-acquire (5-second obscuration)
•
< 3 seconds typical to re-acquire (60-second obscuration)
•
Sensitivity
-124 to -130 dBm (antenna input level)
•
Coarse acquisition
C/A code (1.023 MHz chip rate — code and carrier phase tracking)
•
Environment
Operating temperature: Zero to 55 C
•
Relative humidity: 95 percent (non-condensing)
•
The 8700 automatically switches between six operating modes:
Self-test
•
Initialization
•
Acquisition
•
Navigation (includes four sub-modes: differential 3-D, differential
•
2-D, 3-D nav, and 2-D altitude-hold)
Dead reckoning
•
Fault
•

FIGURE 2 - 8700 ALLSTAR engine operating modes

The six modes are described in detail below.
05/01/97 REV H